scholarly journals Effect of cement fineness and polycarboxylate dosage on the rheological and mechanical behavior of a mortar

2018 ◽  
Vol 149 ◽  
pp. 01037
Author(s):  
Didouche Zahia ◽  
Ezziane Karim
Keyword(s):  
Mechanical Strength ◽  
Mechanical Behavior ◽  
Rheological Behavior ◽  
Organic Additives

The use of certain organic additives in the production of mortar and concrete influences the workability and the hydration kinetic of mortar. This results in a modification of some properties, namely rheological behavior and mechanical strength. The objective of this work is to evaluate the rheological and mechanical behavior of a mortar by varying the fineness of the cement and using the superplasticizer Polycarboxylate.

Secondary Structures and Mechanical Properties of Biomimetic Protein Polymers

2009 ◽  
Author(s):  
Weibing Teng ◽  
Joseph Cappello ◽  
Xiaoyi Wu
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Mechanical Behavior ◽  
Half Life ◽  
Secondary Structures ◽  
Load Bearing ◽  
Protein Polymers ◽  
Human Arteries ◽  
Good Biocompatibility ◽  
Polypeptide Sequences

Silk may possess superior mechanical strength while its resilience is very poor. In contrast, elastin in human arteries is very soft but extremely durable with an estimated half-life of 70 years. By combing polypeptide sequences derived from native silk and elastin, we have produced a series of silk-elastin-like proteins (SELPs), which have displayed a set of outstanding properties such as good biocompatibility and controllable biodegradation rates [1]. In this study, we will examine the crystallization of the silk-like blocks and the crosslinking of the elastin-like blocks, as well as their influences on the mechanical behavior of SELPs. The ultimate goal of this study is to explore the potential of SELPs for applications in the engineering of load-bearing tissues such as arteries.

Porous Gradient Implant for Mandible and Craniofacial Surgery

2008 ◽  
Vol 396-398 ◽  
pp. 269-272
Author(s):  
E.S. Antunes ◽  
T. H. S. Sousa ◽  
C.A. Fortulan ◽  
Jonas Carvalho ◽  
B. de M. Purquerio
Keyword(s):  
Health Service ◽  
Mechanical Strength ◽  
Mechanical Behavior ◽  
Castor Oil ◽  
Biological Interaction ◽  
Bone Reconstruction ◽  
Metallic Materials ◽  
High Mechanical Strength ◽  
Bioactive Material ◽  
Material Composite

Non metallic materials like polyurethane has been successfully used for bone reconstruction in general and specifically in craniofacial and in mandible surgeries as an implantable material. However, any polymer alone cannot be universally successful as a medical device or structural implant because the eventual lack of well defined porous geometry, inherent interconnected porosity, the non dispensable need for a combined mechanical behavior with biological interaction and manufacturing feasibility. In this work, a bioactive material composite with high mechanical strength was designed using a castor oil polyurethane (PU) structure with a functional gradient having a dense core and a porous bioactive surface. The models and replicas for the implants were processed with Rapid Prototyping (RP) techniques and their application (case studies) were fulfilled according to the SUS (Brazilian Health Service) with the support of Santa Tereza Hospital, Petropolis, RJ.

scholarly journals Analysis of the Relationship between Density and Mechanical Strength of Lightened Gypsums: Proposal for a Coefficient of Lightening

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Jaime Santa Cruz Astorqui ◽  
Mercedes del Río Merino ◽  
Paola Villoria Sáez ◽  
César Porras-Amores
Keyword(s):  
Compressive Strength ◽  
Mechanical Strength ◽  
Mechanical Behavior ◽  
Strength Analysis ◽  
Construction Sector ◽  
Exponential Relationship ◽  
Good Adjustment ◽  
Gypsum Plaster ◽  
Polystyrene Waste ◽  
The Relationship

This article develops a relationship between the reduction of density in lightened gypsum and the addition of expanded and/or extruded polystyrene waste from the construction sector and their mechanical behavior. The equations determined in this study allow us to know the flexural and compressive strengths of a lightened gypsum/plaster compound once its density is known. The results show that there is an exponential relationship between the density of the compound and its strength. The methodology followed included a compilation of the results obtained in previous research works on lightweight gypsums, analyzing the relationship between density and mechanical strength and comparing them with the equations developed in this research. The results obtained by previous researchers have a good adjustment with the proposed models, and only perlite compounds present greater deviations in the compressive strength analysis. Also, a dimensionless lightening coefficient is defined which can help to determine the best application for a lightweight gypsum compound, comparing it with an ideal lightweight gypsum.

Analysis of the Mechanical Behavior of Ceramic Filters of the Systems Al2O3-LZSA and Al2O3-SiC

2014 ◽  
Vol 798-799 ◽  
pp. 707-712
Author(s):  
Wagner Lopes Torquato ◽  
E.G. Ramalho ◽  
Wilson Acchar
Keyword(s):  
Mechanical Strength ◽  
Mechanical Behavior ◽  
Compression Test ◽  
Replica Method ◽  
Ceramic Filters ◽  
The Subject

Ceramic filters processed by the replica method have been the subject of increasing research during the late years. In this research, ceramic filters of both 10 and 20 ppi of the systems Al2O3-LZSA and Al2O3-SiC, obtained by the replica method, have been mechanically evaluated using the compression test. The results of mechanical strength have been compared to Gibson and Ashby model. This paper proposes an adaptation of this model to explain the results.

scholarly journals DEVELOPMENT OF CERAMIC MICROFILTRATION SUPPORT FROM MOROCCAN SAHARA CLAY

2018 ◽  
Vol 24 (4) ◽  
pp. 19-27
Author(s):  
NOURLYAQUIN EL QACEMI ◽  
NABIL SAFFAJ ◽  
RACHID MAMOUNI ◽  
NOURREDINE EL BARAKA ◽  
HAMID ZIDOUH ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Slip Casting ◽  
Organic Additives ◽  
Casting Method ◽  
Textile Effluents ◽  
Extrusion Processing

The new ceramic microfiltration support prepared from Moroccan clay (Laayoune region, South of Morocco) is reported in this paper. To optimize the support elaboration conditions, the powder clay is mixed with organic additives and water. The formed paste is shaped by using an extrusion processing and then sintered at 950 °C. The ceramic supports present a porosity and mechanical strength of 44 % and 12MPa respectively. The layer filtration deposition has been carried out by the slip casting method, in order to test its operation in textile effluents treatment.

Starch Reinforcement of Raw Earth Constructions

2022 ◽  
Author(s):  
Julia Tourtelot ◽  
Chloé Fourdrin ◽  
Jean Baptiste d'Espinose de Lacaillerie ◽  
Ann Bourgès ◽  
Emmanuel Keita
Keyword(s):  
Mechanical Strength ◽  
Carbon Footprint ◽  
Wheat Starch ◽  
Organic Additives ◽  
High Carbon ◽  
Compressive Test ◽  
Physicochemical Interactions ◽  
The Earth ◽  
Earthen Buildings ◽  
Raw Earth

The restoration, the protection, or the creation of earthen buildings require improving the mechanical strength of the material. The first way to do that is to use inorganic additives, but these additives change the structural properties of earth and have a high carbon footprint. In contrast, the other way to consolidate is the use of organic additives such as vegetal derivatives that rearrange the minerals in the earth, with the lowest carbon footprint as they are from waste management. After preliminary tests with ten different organic additives from traditional recipes, we found that wheat starch improves the earth strength up to 50 %. In this study, we related the mechanical strengthening to the physicochemical interactions between clays and starch. We focus on three clays that represent the three main groups of clays: kaolinite, illite and montmorillonite. For this study, we mainly focused on compressive test and rheological tests. We showed that the improvement of the mechanical strength with starch is depending on clay nature and their chemistry. Then, we can recommend formulations based on the earth nature for new sustainable buildings. Furthermore, we can understand why it was an interesting way to use starch as a strengthening agent in traditional recipes and how it could be used to repair and protect buildings made of earthen material.

scholarly journals Effect of Extrusion Temperature on the Microstructure and Mechanical Properties of SiCnw/2024Al Composite

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2769
Author(s):  
Shanliang Dong ◽  
Bin Zhang ◽  
Yuli Zhan ◽  
Xin Liu ◽  
Ling Xin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Mechanical Strength ◽  
Mechanical Behavior ◽  
Average Length ◽  
Research Work ◽  
Extrusion Temperature ◽  
Sic Nanowires ◽  
Peak Aged ◽  
Higher Temperature

In the present research work, the effect of extrusion temperature from 480 to 560 °C on the microstructure and mechanical behavior of the SiCnw/2024Al composite (15 vol.%) has been explored. It has been found that extrusion at higher temperature (above 520 °C) was beneficial for the densification of the composite, while the residual average length and alignment of the SiC nanowires were also increased with the extrusion temperature. Moreover, higher extrusion temperature was helpful for the mechanical strength of the SiCnw/2024Al composite, and the peak-aged SiCnw/2024Al composite extruded at 560 °C revealed the highest strength (709.4 MPa) and elastic modulus (109.8 GPa).

Characterization of a self-compacting sand concrete using the quarry waste

2009 ◽  
Vol 36 (11) ◽  
pp. 1773-1782 ◽  
Author(s):  
A. Abidelah ◽  
A. Bouchaïr ◽  
D. Kerdal ◽  
K. Ayed
Keyword(s):  
Mechanical Behavior ◽  
Rheological Behavior ◽  
Environmental Problem ◽  
Mechanical Performance ◽  
Maximum Size ◽  
Water Volume ◽  
Volume Weight ◽  
Fresh State ◽  
Hardened State

Self-compacting sand concrete (SCSC) can be made by using the quarry waste, thus helping to reduce the actual deficit in aggregates in Algeria and contribute to the solution of an acute environmental problem. The SCSC presented in this paper is made with aggregates whose maximum size is less than 5 mm. Several mixes were prepared by varying parameters, such as water volume, weight and nature of cement, weight of sand, nature of admixtures, and shape of aggregates. Each one of the SCSC mixes has been analyzed by considering its rheological behavior in the fresh state and its mechanical behavior in the hardened state. In the fresh state, the elaborated SCSC satisfies the recommendations of the Association Française de Génie Civil (AFGC) and in the hardened state, its mechanical performance is good.

scholarly journals Alternative Liquid Assisted-Sintering of AL/CU Composites Using Selective Powders of AS-Cast Al-ZN Alloy

2022 ◽  
Author(s):  
Eder Lopes Ortiz ◽  
Wislei Riuper Osório ◽  
Ausdinir Danilo Bortolozo ◽  
Giovana da Silva Padilha
Keyword(s):  
Mechanical Properties ◽  
Energy Consumption ◽  
Powder Metallurgy ◽  
Aluminum Alloys ◽  
Mechanical Strength ◽  
Mechanical Behavior ◽  
Initial Powder ◽  
Wide Range ◽  
Reduction Of Energy Consumption ◽  
Zn Alloy

Abstract Al and its alloys constitute one of the most versatile, economical and attractive materials for a wide range of applications. The 7xxx and 2xxx series alloys are those of achieving the highest mechanical strength among aluminum alloys. In this investigation, using powder metallurgy provides the microstructural and mechanical properties characterizations of non-commercial Al6Cu5Zn alloy by using powder metallurgy. Initial powder sizes are determined and the best condition is obtained for the distribution comprised between 75-106 μm. The samples are sintered at 585 oC, 600 oC and 615 oC during 0.5, 1.5 h and 3 h. It is found that mechanical behavior similar to as-cast Al-Cu based alloys is attained (~ 125 MPa) when the samples at 615 oC during 3 h are sintered. Considering the reduction of energy consumption and metal fumes commonly produced in foundry, Al-Zn powder can be used with Al and Cu elemental powders to constitute an Al6Cu5Zn alloy.

Estudy of Natural and Degradation by Salt Spray of Red Ceramics Incorporated with Ornamental Rock Waste

2012 ◽  
Vol 727-728 ◽  
pp. 1519-1524 ◽  
Author(s):  
Larissa Machado Altoé ◽  
Gustavo de Castro Xavier ◽  
Fernando Saboya Albuquerque ◽  
Paulo César de Almeida Maia ◽  
Jonas Alexandre ◽  
...  
Keyword(s):  
Sodium Chloride ◽  
Weibull Distribution ◽  
Mechanical Strength ◽  
Mechanical Behavior ◽  
Material Properties ◽  
Salt Spray ◽  
Ceramic Samples ◽  
Before And After ◽  
Red Ceramics ◽  
Properties Of Ceramic Material

To better study the mechanical behavior of red ceramic, the samples were degraded in salt spray equipment and exposed in environment. The salt spray equipment subjects the samples to conditions found by the sea, through the mix solutions of sodium chloride. The ceramic samples were prepared with up to 10% by mass of ornamental rock waste to dry and pressed into rectangular mold of steel. The materials were fired at temperatures of 650°C, 750°C and 850°C. After 90 days of degradation natural and 45 days in salt spray, ware analyzed the properties of ceramic material. The results of mechanical strength were compared using the Weibull distribution, before and after the degradation. Note that the material with ornamental rock waste raised the mechanical strength and didnt significantly changes the material properties after degradation.

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